Apparatus for producing a pressed pattern in paper



April 5, 1960 HISASHI MATOBA 2,931,064

APPARATUS FOR PRODUCING A PRESSED PATTERN IN PAPER Filed Sept. 10, 1957 'Fig.]

INVENTOR HISASHI MATOBA BY "WM ATTORNEYS APPARATUS FOR PRODUCING A PRESSED PATTERN IN PAPER Hisashi Matoba, Nara-shi, Nara-ken, Japan Application September 10, 1957, Serial No. 683,034 1 Claims. (Cl. 18-35) The present invention is concerned with the process and apparatus for producing a pressed pattern paper or other similar materials.

The main purpose of the present invention is to produce the rugged pattern on the surface of the paper to be processed and to form easily any shape of solid body by paper to be treated.

Besides, it is an important purpose of this invention to make the boundary line between the rugged parts of the rugged pattern appeared on the paper processed and the plane part of the paper definitely as both of which cross each other at right angle, nothing to damage the precessed parts of this process and the apparatus for which is extremely simple.

Fig. l is a cross-sectional schematic view of the device for initially forming a pattern in the paper to be treated.

Fig. 2 is a cross-sectional view of a mold for further impressing a pattern in the paper.

The following is the explanation of the content of this invention from the said figures.

In the Figure 1, numeral 1 indicates the upper casing, 2 indicates the lower casing, and 3 and 4 show the frames which are stretched by the rubber cloths lined with sponge rubber or ordinary rubber, and between which the paper to be processed is inserted, and is tightened with the casings 1, 2 by bolts 8.

9 shows the female mold which is positioned in the lower casing 2 and has small holes leading to the hollow parts.

11 and 12 show the air inlets which are connected to the pressurizing pump, 13 shows the air outlet which is connected to the vacuum pump and 14 indicates the pressure gauge as well as 15 indicates the vacuum gauge.

At first, the compressed air is sent to the tightly closed areas which are formed between the casing 1 and frame 3 as well as the casing 2 and frame 4.

When the pressure of the areas reaches at 2-5 atm. (the pressure may be adjusted depending on the quality of the paper used), air is sucked out gradually from the lower casing 2 and at the same time, the pressure in the upper casing is increased to through 7 atm.

In this condition, the paper 7 is forced closely to the rugged surface of the female mold 9 with the cloths 5, 6 which are stretched on the frame 3, 4. Then, exhausting the air in the lower casing 2 to vacuum, the cloths and the paper are pressed strongly downward and is completely adhered to the surface of the female mold.

As the next step, the upper cloth which is adhered to the female mold with the lower cloth, is detached from frame 3 and the paper is dried a little to send the heated air into the frame and maintain the same shape as adhered to the female mold.

Further, taken off the upper casing, the paper is removed from the mold and is transmitted to the next process.

The apparatus for the next process consists in a further female mold l6, shape of which is coincidental with the said rugged pattern, and the male mold 17 which is coincidental with the above female mold.

In the next process, the paper transformed in the first process is put between the molds and pressed, then the rugged pattern and the shape appeared on the paper,

transformed is made more definitely and completely by these female and male molds.

Namely, in the first process, although the paper is pressed down and transformed according to the rugged surface of the female mold at the position where the paper is placed between the cloths 5, 6 which are placed on the upward and downward side of the paper. This transformation of the paper can be made without difiiculty because the both sides of the paper is protected by rubber cloths completely, and even if the thickness of the paper at the protruded part is decreased, the damage such as breakin is never happened.

After that, as explained in the above, the rugged pattern and the appearance, roughly formed by the first process, is finished by the second process as the complete one, and the boundary line between the plane parts and the rugged part is definitely as these parts cross each other at right angles.

In addition of the above procedure, the part of the paper which is thinned by this process can be strengthened to apply the reinforced materials such as vinyl liquid and cement.

Up to the present, this kind of processing has been done only pressing the paper by the female and male mold, and in the procedure the paper processed has been easy tobe damaged owing its forcible pressing, especially it has been almost impossible to make out the violently rugged pattern or the same kind of appearance on the paper.

However, the required purpose can be fulfilled easily and completely by applying this invention.

For instance, in case of applying this invention for painting, the painting can appear realistic giving the complete feeling as if it was a solid body, and further any shape of the object can be obtained by this process easily to form the outer and inner surfaces of the object and to combine them.

Therefore, this invention can be applied extremely wide field.

What is claimed is:

Apparatus for producing a pressed pattern in paper comprising a hollow open end casing, a resilient cloth extending across and closing the open end of said casing, a second hollow open end casing, a second resilient cloth extending across and closing the open end of said second casing, means connecting said first casing to a supply of compressed air, a mold block positioned within said second casing having the desired pattern for said paper provided on a face thereof positioned opposite said second cloth, said block having perforations extending to said pattern face thereof, means for connecting the interior of said second casing and said block perforations to a source of compressed air, further means connecting said second casing and said block perforations to a vacuum when desired, and means for detachably retaining therebetween said casings open ends together with their resilient cloths facing one another for supporting the paper to be treated between said cloths.

References Cited in the file of this patent UNITED STATES PATENTS 286,693 Fried Oct. 16, 1883 459,164 King Sept. 8, 1891 1,324,935 Sims Dec. 16, 1919 1,623,111 Hall Apr. 5, 1927 1,637,532 Oliver et a1 Aug. 2, 1927 2,054,864 Owen Sept. 22, 1936 2,116,198 Hawley May 3, 1938 2,392,108 Vidal et al. Jan. 1, 1946 

